Eyeglass lens grinding apparatus



Feb. 3, 1948. H. METZGER Err AL 2,435,320

EYEGLASS LENS GRINDING APPARATUS Filed May l, 1946 2 sheets-shea 1 Feb.3, 1948. 1 H. METzGER Er -AL 2,435,320

' EYEGLAss LENS GRINDING'APPARATUS 2 Sheets-Shee 2 l Filed May l, 1946Patented Feb. 3, 1948 UNITED STATES:` PATENT OFFICE 11 claims. w1.'51.1345) The present invention relates generally to apparatus for use ingrinding eyeglass lenses. More particularly the invention relates tothat type of eyeglass lens grinding apparatus which as its principalcomponents or parts comprises (1) a base structure which carries anelectric motor and is supported in an elevated position by way of atable, bench or other support; (2) a vertically extending spindle whichis mounted by way of anti-friction bearings on the base structure torotate about its axis, has a driving connection.

between it and the armature of the motor whereby it is driven inconnection with operation of the motor, and embodies an upwardly taperedupper end; and (3) a rigid horizontally disposed wheel which embodies inthe hub portion thereof an upwardly tapered open bottom socket wherebyit may be mounted removably on, and connected for friction drive by, theupwardly tapered upper end of the spindle, has the upper end surfacethereof curved and provided with abrasive particles, and is adaptedwhile being driven by the spindle in connection with a lens grindingoperation to have a lens blank pressed against its upper end surface inorder that the blank is ground by the abrasive particles to a curvaturecorresponding to that of the upper surface of the wheel.

In grinding a lens blank with an apparatus of the aforementioned typethe blank is first rough ground by way of a wheel having coarse abrasiveparticles, is then ground by way of a grinding wheel having inerabrasive particles,

and is then provided with a so-called nish"V grind by way of a wheelhaving still iiner abrasive particles. vIn order to subject the lensblank to the three separate and independent grinding operations it isnecessary successively to mount the 'grinding wheels on the power drivenspindle. This requires for each successive grinding operation stoppingthe apparatus and thenv removing one grinding wheel and replacing suchwheel with another grinding wheel. In practice it has been found thattime is consumed and diiliculty is e11-V countered in removing agrinding wheel preparatory to replacement thereof by another wheel dueto the fact that the friction drive between the wheel and spindle isgenerally so tighter secure that it is necessary in connection with awheel removing operation to stop the apparatus and then break thefriction drive between the wheel and the spindle by tapping the wheel inan upward direction by a hammer or like tool.

The primary obj ect of the invention is to provide an eyeglass lensgrinding apparatus which is an improvement upon, and eliminates the dis-2 advantages and detections of, conventional apparatus by reason of thefact that it embodies as a part thereof a simple and novel devicewherebyv at the end of any lens blank grinding operation the grindingwheel on the upwardly tapered upper end of the power driven spindle maybe quickly and readily raised a slight distance with respect to thespindle inorder to break the fric-l tion drive between the wheel and thespindle and thus release the wheel so that it may be removed from thespindle without the use of a hammer or similar tool. Y

Another object of the invention is to provide an eyeglass lens grindingapparatus of the last mentioned character in'which the device forseparatlng or raising the grinding wheel with respect to the spindle atthe conclusion of a grinding operation and preparatory to replacement ofthe wheel by another wheel for further grinding of the lens blank beingground,V comprises a lever which is mounted for vertical swingingmovement and has at one end thereof means operative in response toswinging movement of the lever in one direction to engage the grindingwheel with sufficient pressure to break the friction drive and raise thewheel a comparatively small distancewith respect to the spindle.

Another object of the invention is to provide an veyeglass lens grindingapparatus of the type and character under consideration in which thelever.

i o f the wheel removing device has limited vertical f swinging movementin both directions and the 4'wheel engaging and raising means of thedevice is V adjustable in order to-control or selectively determine orvary the amount of raising of the wheel with respect to the spindle whenthe lever swung to its full extent in the proper direction for eiectingremoval of the wheel.

Another object of the invention is to provide an eyeglass lens grindingapparatus of the last mentioned type and character in which the lever ofthe device is in .the form of a foot actuated treadle and the wheelengaging and raising means of the device embodiesv a rod lwhich extendsthrough a longitudinal bore inthe power driven spindle of the apparatusand is adapted when intended prposealnd isy characterized 'by the factthat it may be operated expeditiously -arid with f acility.

Other objects of the invention and the various;

advantages and characteristics of the. present.. y d

''tre' I# into" the" central lower portion of the eyeglass lens grindingapparatus" will beappart' from a consideration ofthetfollivirlg.-detailed@ description. l .K The invention consists intheiseveral'-litt/telef@a;v

more particularly dened by claims atY clusion hereof. n In the drawingswhich accompany and form apart of this speciiit'zatiflny or disclosureandi-rr Figure 1 is .-vertical longitudinal section of an eyeglass lensgrinding apparatus embodying the` invention;

Figure 2 is a fragmentary front-view illustrate ingi'n detail theconstruction! and desigr'r orf the device for raising the grinding'wheel witllrespect to the spindle iri-orderto break the triatlondrivebetween 'thewheel and tliespindl preparatoryV to removal or the wheelfor purposes et replace'- rient or substitutidr'ia'd l y 5 Figure 3 is''enlarj scti'ntaken onhe line -3--1-'3 of Figure 1- nd -sl'wiiig 'themarine in which' the' rod of theY wheel removing ydeiiee eir-v tendsthrough the longitudinal bere the spindle of the apparatus andV servesiricorlectior'i with upward shift-thereof tfliaise the 'wh-'eelaslight"- distarice with resp-eet "to V the vspindle ,and also` showing'the manner iiiwliicli the brake iiiear'i'sl` that associated wltli thewlieelrinovliig device oberstes connection wi'tli actuation df'triedeviceto brake tnespiiidle. p g

'The' apparatus which isushown the" drawings constitutes the preferredfoi i' `eliloo clifniQlit';of

the invention. It is essentially designedA f'r erin-d'ingtp. apredetermined curvature elfe` glass lens blank 5" and as it prin-cipal'parts 'corrie prises s, basefst'ructurec, a wlsliaped receptaclel 1, avertically extending sii et, a grinding' wheel 9, a. pressureeiiertirigsriii l0 and a device ll rer use irl effec'tiii 'eijncvalofthe grinding wheel '9 when' it isdesi d to substitute another wheelfor it in connection with lens blank grinding operation: i" y The bass'structure s positioned or mounted on a table I2 iii.` "l'tllat 'it isrS'lllIOI't'ed at a suitable-insight abete the ricerca which the 'tablerests. It isliorizbiitallyelo ted and embodies a; ridrizontal tp wallYi[7g/fand 'a continuousde: pending side wall lll-. Tnetop wall I3rennes with the dependigside wall it open sottoincoiiipartment #Band has'at one eii'dptliereof an ist ralilijpstan-ding arirdla aange-'ldthsupper margin of lisrsliaped td'fdrni seat-11;. f

The receptacle 1 surrunds'fand serves Vas* ashi'el'd for thegrinding-.wheel V9 during a lens blank grinding operation and. consists'of `a cire I cular bottom wall anti-l cylindrical side' wall which` isconnected-to and `"extends upwards from the outer marginal portiorlyofYthe bottom virali` Such marginal portion of thebottom wall.v of thethereof extends vertically; A vconventional switchj (not shown)serves'to'tcontrol. the motor.` Itais an'tly stop" drive of thev spindle8. The belt arl-dfV flange I6. As shown in Figure 1 of the drawings thebottom wall of the receptacle I has a centrally disposed circularaperture I8. The receptacle i's removable from the base structure 6 inorder that it may be cleaned.

The vertically extending spindle has the central portion'thereof'vjournalled irlanti-friction bearingsvv I9 ori the top' Walll ofthe base structure 6 and is arranged so that the lower end thereofprojects into the compartment I5 and its upper end. projects upwardsthrough the -circular aper- .interor of the', receptacle 1. As shown inFigure lJ3-the'bearingsilvre so arranged and designed tures which arehereinafter setyfortll andl are the? C011 Y tlafftly hot'orlly' supportthe spindle for rotatien- V aboutits;axis but also hold the spindle yagainst` axial displacement relatively to the top wall'fo the basestructure 6. An electric motor 20 serves to drive thefspindle 8 throughthe mediu-mof albeltand pulley connection 2|. Such motor ismountedongthe lenclfof the top wall I3" that is opposite theiupstan'dingannular flange I6,-

arid -isJ-arrangedsothat the armature shaft contemplatd'- thatafterveach lens blank grinding.-

operation 'thezs'witchA will be shifted into its open.

position in order to stop they motor and resulta pulleyconnectiorizzlisv located in the open bot#v tomf compartment I5 and includes a pulley(not shown) .onf the lbWeriendf-or the armature shaftv ofthe-matorrales; pulley 22f'on the' `lower end 'of receptacley rests on;ancla'is4 shaped conformably two'pulleys. Preferably the electric motor'Ellis afconstant speed motorandserves in rc@inflection With the beltyand illeyconnection 2l to drive7 the'spindle-sat-aspeed in excess df1000 R. P. M.

i The spindle' 8 lla'sits upper lend tapered upwards? to a 'smalldegree. as shown vin Figure 3, and eni-` bou es a centrally disposed.longitudinally sxter'id-YL ingbor 24;. Thela'tt'er is preierabl'y' of'urliforn-i diam er 'f-rsliig grid-te end and extends tlireiiglltrie 'rand lower end surface of the spindle,

member' is ltcatedbsiiesth 'the pulley 2f2 sfjtlisv telt and pulleydri-ving connection 2l and siennes;

'l afiinternal 'upwardly tapered or: frusto-conical scc-liet* et; trisupper eri-il' for which communicates tutti.v trie lower edd sf theldngitudinally extend-1 ingm leere z lliii 'triespludle-B. y Y* 'l.'-li=e"grirrcllingwheel 9 serves in connection with use-ercperatidd di'the apparatus te grind 'tile ler-isolani; ics-'tiled'es'irsd curvatureand somprisesja circular' ordiscL-like body 2l and a hun 2t. rtisZjiiriiis-lly located within die cen-usi low poit'l'rthe interior 'offthe recer'ltaleX'I` an 2`l therefor-1 egtends'- liorlzontally.`-P'rsff'erably' tire todi arrdiiubgoff tire wheel are Afer'iriec'lintegrally urithjfone'anotheriy lrass, Vbror'iz'e 'or y'any 'othersjuitaltiepmetaris used te fermfthe -wl'ieel vand die latterisp'refer-Yri thejferrno astirig'. The upper .surfaced *Y the body' 2'Ifo 'thegrinding wheel'iscurved cnforniably to theeiiryature that is"de`siredtobefoin'red in the lens blank 5; If tll' lens Elan-k' is to be ground ina 'concave' fas-nien tli'epper end s rfacejof` the 'Wheel 'body 2T iscn'vex' as .,sllinffi'rl thetirawi'ng. YIf tll'e'lens' blank to .be.g'roi'n'sd as tchate aconvex 'surfacelte'worlirig/ Sdr upper. endsurface df' the wlaeeibodyis adeso tha s-concavb ordislid.

Vsaid upper endsurface df "trie wlisl" Body is 'cdv'-V ered withabrasive particles which are embedded' blank 5 the abrasive particlesare coarse, whereas v if the wheel is to be used for an intermediate orso-called finish grinding operation the abrasive particles on the upperend surface of the body of the Wheel are of ne mesh. The abrasive par`4ticles may extend throughout the entire area of the upper end surface ofthe outer body and are uniformly distributed throughout the matrix. Thehub 23 of the grinding wheel is connected to, and depends from, thecentral portion of the circular .or disc-like body 21. It embodies acentral open bottom socket 29 which is shaped and adapted to receive theupper end of the spindle 8. As shown in Figure 3 the socket 29 isupwardly tapered in conformity with the upper end of the spindle inorder that when the wheel is in place with respect to the spindle thereis a friction drive between the two whereby the Wheel is connected tothe spindle for drive thereby. When it is desired to replace thegrinding wheel 9 with another wheel having abrasive particles ofdifferent mesh than those on the upper end surface of the Wheel 9thewheel, as hereinafter described, is urged upwards by the device I I inorder to break the friction drive between the hub and the wheel and theupwardly tapered upper end of the spindle. The upper end portion of thehub 28 of the grinding wheel is solid in order to provide a closuremember 33 at the upper or small end of the upwardly tapered socket 29. A

4 The arm IB overlies the receptacle 1 and nor-v mally extendssubstantially horizontally. One end of the arm is shaped to form ahandle 3| and the other end is pivotally connected to a rotatablestandard 32 in order that the arm is permitted to swing up and down andalso laterally. A substantially vertical rod 33 extends through thecentral portion of the arm I and has a pointed lower end. The latter isadapted to t within a socket in a holder 34 for the lens blank 5. Afterthe lens blank to be ground is applied to the holder 34 it is placedagainst the abrasive covered upper end surface of the grinding wheel 9.Thereafter the lower end of the rod is inserted into the socket in theholder and the blank is urged downwards by applying downward pressure toit through the medium of the pressure arm I9. During a lens blankgrinding operation the blank and lholder spin about the rod and thelower surface of the blank is ground as the result of the abrasiveaction of the abrasive particles on the upper end surface of the wheel.

The device II has a twofold purpose in that it serves when actuatedafter a lens blank grinding operation to raise the grinding wheel 9 to alimited extent with respect to the spindle in order to break thefriction drive between the wheel hub andY the upper end of the spindle,and also to brake or stop the spindle. It is located for the most partbeneath the base structure E of the grinding apparatus and comprises abracket 35,

a. lever 36, a composite extensible shaft 31 and a rod 38. The bracket35 is located under the table l2 and consists of a floor engaging bottomplate 39 and a pair of laterally spaced upstanding side plates V49. Thebottom plate 39 of the bracket is shaped to t flatly against the floorand embodies holes Y4I lfor lag screws'42.

table I2 on which the base structure 3 of `the apparatus is lpositionedor mounted. As shown in Figure l the bracket 35 of the device II isdisposed directly beneath the front portion of the base structure 6and'between the front legs ofv the table I2.'v The lever 36 is in theform of a the lever 36is provided with a foot pedal 44.-

When the foot pedal is depressed by the operator of the apparatus thelever 36 is caused to swing 'in a counterclockwise direction as viewedin Figure:

The rear end of the lever 36- is provided with a depending stop screw 45for4 l of the drawings.

limiting clockwise swinging movement of the lever. `The shank of thestop screw extends into aninternally threaded socket in the rear end oftheA lever 36 and embodies a lock nut 4B for securing it in place. Thehead of the stop screw is adapted to abut against the floor when thelever 36 isswung to its fullest extent in a clockwise direction. Byadjusting the stop screw 45 inwards or outwards with respect to the rearend of the lever 33 the extent of clockwise swinging of the lever 35 maybe regulated or adjusted. A leaf spring' 41 urges the lever 3B to swingin a clockwise direction as viewed in Figure 1. One endof this: springbears against the portion of the lever 36 that is directly inwards ofthe foot pedal 44 and the other end of the spring is disposed betweenthe side plates 40 of the bracket 35, and is opera. tively connected toa pair of bolts 48. When the. outer end of the lever 3B is swungdownwards the free end of the leaf spring 41 swings downwards. and whenthe outer end of the lever is released such free end of the leaf springsprings upwards and serves to shift upwards or retract the outer. end ofthe lever. The extensible composite rod or shaft 31 is located above,and projects upwards from, the rear end of the lever 36 and comprises atubular lower section 49 and a solid upper-section 523. The lower endVof the tubular lower section 49 is bifurcated. It straddles the rear endof the lever 36 and is pivotaiiy connected thereto by way of ahorizontal pivot pin 5I. When the lever 33 is swung in acounterclockwise direction as the result of the operator depressing thefoot pedal 44 the upstanding composite shaft 31 is shifted upwards andwhen the lever is swung in a' clockwise direction by the spring 41 inconnection with release of the foot pedal 44 the shaft 31 is shifteddownwards. The lower end of the upper shaft section 5i! i'lts slidablywithin the upf per end of the lower shaft section 49 and is releasablyheld in place by means of a set screw 52. The latter extend transverselythrough the npper end of the tubular lower shaft section 49 and whentightened locks the upper shaft section against sliding movement withrespect to the lower shaft'section. When the set screw is re leased theupper Ashalftzsection may be slid up# wards Vor downwards with respectto the tubular lower section in order to adjust the over-all length ofthe upstanding shaft 31.4 The upper end of The latter serve fixedlyto'secure the bracket in place. The.' side plates 40 of the bracket areconnected to, and project upwards from, the central portion of the.bottom plate 39 and extend lengthwise of the" horizontal grinding wheelhaving a depending hub part shaped to slide into interfitting relationwith the upper end of the spindle when the wheel is shifted downwardstowards the spindle and adapted when in such relation to connect thewheel for frictional drive by said spindle, and a device designed foruse in disconnecting the wheel from the spindle after a lens grindingoperation and embodying a lever located beneath the spindle and mountedto swing in a vertical plane, an upstanding shaft positioned beneath,and in alignment with, the spindle, having the lower end thereofpivotally connected to the lever, and adapted when the lever is swung inone direction to move upwards into a position wherein the upper endthereof is in abutment with the lower end of the spindle, and avertically extending rod extending longitudinally through the bore inthe spindle, having the lower end thereof connected to the upper end ofthe shaft, and adapted when the shaft is shifted upwards in response toswinging of the lever in said one direction to raise the wheel to aslight extent with respect to the spindle and effect breaking of thefrictional drive between said hub part and said upper end of thespindle.

3. A lens grinding apparatus comprising a vertically extending rotatablymounted spindle provided with driving means therefor and hav-ingv a boreextending longitudinally therethrough, a horizontal grinding wheelhaving a depending hub part shaped to slide into intertting relationwith the upper end of the spindle when the wheel is shifted downwardstowards the spindle and adapted when in such relation to connect thewheel for frictional drive by said spindle, and a device designed foruse in disconnecting the wheel from the spindle after a lens grindingoperation and embodying a lever located beneath the spindle and mountedto swing in a vertical plane, an upstanding shaft positioned beneath,and in alignment with, the spindle, having the lower end thereofpivotally connected to the lever, and adapted when the lever is swung inone direction to move upwards into a position wherein the upper endthereof is in abutment with the lower end of the spindle, and a verticalrod extending longitudinally in the bore in the spindle, having thelower end thereof connected to the upper end of the shaft so that it islongitudinally adjustable with respect to said shaft, and adapted whenthel shaft is shifted upwards in response to swinging of the lever insaid one direction to raise the wheel to a slight extent with respect tothe spindle and effect breaking of the frictional drive between said hubpart and said upper end of the spindle.` f

4, A lens grinding apparatus comprising a vertically extending rotatablymounted spindle provided with driving means therefor and having a boreextending longitudinally therethrough, a

horizontal grinding wheel having a depending hub-v part shaped to slideinto intertting relation with the upper end of the spindle when thewheel is shifted downwards towards the spindle and adapted when in suchrelation to connectthe wheel for frictional drive of said spindle, and adevice designed for use in disconnecting the wheel from the spindleafter a lens grinding operation and embodying a lever located beneaththe spindle and mounted to swing in a vertical plane, an upstandingshaft positioned beneath, and in alignment with the spindle, having thelower end thereof pivotally connected to the lever, adapted when thelever is swung in one direction to move upwards into a position whereinthe upper end thereof is in abutment with the lower end of the spindle,and consisting of upper and lower telescopically and adjustablyconnected shaft sections, and a vertical rod extending longitudinally inthe bore in the spindle, having the lower end thereof connected to theupper end of the shaft so that it is longitudinally adjustable withrespect vto said shaft, and adapted when the shaft is f 5, A lensgrinding apparatus comprising a vertically extending rotatably mountedspindle provided with driving means therefor and having a bore extendinglongitudinally therethrough, a horizontal grinding wheel having adepending hub part shaped to slide into intertiting relation with theupper end of the spindle when the wheel is shifted downwards towards thespindle and adapted when in such relation to connect the wheel forfrictional drive by said spindle, and a device designed for use indisconnecting the wheel from the spindle after a lens'grindng operationand embodying a lever located beneath the spindle and mounted to swingin a vertical plane, an upstanding shaft positioned beneath, and inalignment with, the spindle, having the lower end thereof pivotallyconnected to the lever, and adapted when the lever is swung in onedirection to move upwards into a position wherein the upper end thereofis in abutment with the lower end of the spindle, a vertically extendingrod extending longitudinally through the bore in the spindle, having thelower end thereof connected to the upper end of the shaft, and adaptedwhen the'shaft is -shifted upwards in response to swingingof the leverin said one direction to raise the wheel to a slight extent with respectto the spindle and effect breaking of the frictional drive between saidhub 'partiand said upper end of the spindle, anda spring applied to thelever so that'it serves to urge the lever-to swing in the oppositedirection in order to retract the shaft and rod.

6. In a lens grinding apparatus of the type that comprises a rotatablymounted spindle with driving means therefor, and a grinding wheel havinga hub part shaped to slide into interiitting relation with the spindlewhenthe wheel is shifted towards the spindle andradapted when in suchrelation to connect the wheel for frictional drive by said spindle, thecombination of a movably mounted member, means operative automaticallyin responseto movement of the member in one direction to brake thespindle, and means operative automatically in response to shift of themember insaid one direction to shift the wheel away from'the spindleforl removal purpose and eiect'breakingof the frictional drive betweenthe m hub part and the spindle.

7. In a lens grinding apparatus of the type that comprises arotatably'mounted spindle with driv- Y "ing means therefor, and agrinding wheel having f a hub part rshaped to slide into interfittingrelation with the spindle when the wheel is shifted towards the spindleand adapted when in such relation to connect the wheel for frictionaldrive by said spindle, the combination of a member mounted so that it isshiftable bodily back and forth, brake means operative automatically inresponse to shift of the member in one direction to arrest drive of thespindle and means connected `to the member and operative automaticallyin response to shift of said member in Said one direction to shift theWheel away from the spindle shiftedv4 towards the spinuie and'- seaet'ewwhen; in f forwheei removing purposes and? eieot breaking. tliereotEconne'eted? to tirelever stndflts` upperfend oftlieiri'ctionafldnvethe-huilt parti provided with ai ccmeisingl brake member, "andsai'despi'nde; v i l adpted when# thelevenis swungin. onev direction 8.Ina lens grindngfapparatus of tleitypeetlliat liminaire1upwirdsinto"aepositioniwhereinithe' co- Uompri'ses a. rotatablymountedispindlewiti drive? 5* nei/ing brakeemembenat its upper'end. is: inabutngj means therefor, and'` a; grinding' wheel vlianment withthe rstmentionedbrakemember, `and ing, a hulo` part sha-pedto slideTiiitjoiiiiterfiztliig.. theitwo membersf serve: to:I arrest. driveof.the relation with' .the spindle` when'A the wheel spindle; aim'emberconnected?. tovtheupper: end of tariefy shaft sindv a'cleipi'e'd1 inconnection Witlr. up-

.sueli' relation to connectitheiwheef for f 'riet'ionefl-l mi `wmdf-nrinvementi'ofthe slaJ-ftit'raisefthe wheel; to

drive by saidispindle; theV combinationvof'a; njrexnzl we slight'extent! Witlr respect totl'ie spindle,v and ber mounted so that it isshiftable' bodily' hack eieet breaking off tliefrictional drivebetweenithe and forth; brake meansioperativefautomatically Wheel hub partafndfsain upper end of the spi'nin response tov shift'. ofthejineinbeit'infpne lifiedjlfe', and spning'mean's applied toi/ghe.-l'eve'r. so. that tion toY arrest. drive of thespindle; means cond is?liiifser'vfesitoure'eetiie latterftio s'vszingl in the. oppoicallly in'responseto s hifsj of sail'member in said lill.A-lens'grindingappetratuscomprisingfaverone direction toV shift thewheel away' frozl tiljie vtleallyextending'rotatablymounted'spindlepro.. spindle' for wheel.` removingv purposes* and effectvidedw-ithdriyemeansfthereohaving'a.boreex breaking of the frictional'drivezbet'ween tliehgi-1j'a 2): #Ending llmgitudinllybhelthrOUgh'aHd'emOdypart and' said spindle',y and? spring; meansapplied i'ngfat itsflower end-va: brake' member; ai horizontal to themember so that riturges the; latter. inthe 8"1"i1 1d1g Whe having atylel'ndHg` huh" Dart opposite direction. r M slapedlto' slide-into-i'nterfitting'relation-.Withithe 9`. A lens grinding-apparatus;.ompriging n v upnerendoi:thespindleiwlen.tlewheellisishifted(fombnationA Hra, .vertically extpqngf rijgijgjl,r [gg tUWaTdSf the?Spindle aldadapted mountedspi'ndle proViledwitlLnie-an's iondrioin Whenvinl relation'. toi' connect'. the; Wheel. for it and embodyinganitslower. enxazbrake friztonail drive-byf-vsaid spindle, a; leverlocated bene. liorizontalgri'ndig'wheel-having a depend; beneath fifi@Spindlel and? mounted'. to swing' 11T a ingliub part shapedto.slidein'o.intertting'pelal A *ver-tie'ztlifplane;V en. up'slanding shaftpositioned tion with. the upper endv of the' Spindle when'.trie@` 3'0"leneathg.:andinialignment;with; th'efspindleilhavwheei is. shifteddownwards towards the' spingi@msfrthlbwerfendtherebfpivotelly"donnectedvto and adaptedi when. in, suchnatation t, connect; 'the-lever anditsupper endprovidedfwitheconjetthewheel for. f'ricti'pnal drive, by said', spimnfswfa",v lingbrakemembei-andadapted-:when the lever4 is rever moeten, beneath. thespindle. and :munir-.m1` Swuleil'y One' direction to move upwards info?a tofswingin. a vertiea1 planqgn, upst'agngmshgnnw position wherei'na'itsb enacting." lorekeymember.` is positioned'.beneath anim.ii'gnment.with,.tiie .irreneasement withitnef firstm'en'tloned'.- brakespindle, having,Y the. lower. end tiereof. connected' l memberandfheftwoi-brake members? serve to ar- 13D, the lever and., ifs, end;pfgyidgd wlji;h` -IYBS dIiVB pff the*- SDIICUBQ'- and' Vl'ti'cal. 110@6X- coastingv brake. member, anddptedwhem the tmilg longitudinallythrough the'- bor'eln'. the levei; is. swung. in. one. alreet'ion tomoyeugiwarH-s{0L-spindle; havingf the. lwer end' thereof. connectedinto. a. position whereigtthecgactmg, rakgmmtoitlieiuppex'endloi-"the'sletftgy and'. adapted? when ben M 'iupper endfsinabmmengthgt" tlie shaftisl :novedl upwards? intnl the*aforemenmentionedv brakememlerl arid-.the twoP members time@ DUSOHD"fasetwheeltb' a' slight eX- serveto arrestdrive of the Vspindle,.stricto;n gin. j v tentwith'frespect'torthe spin'dleiand'efeot breakberconnectedv tothe upper end. ofthe' snaft; and lng'orthenictionafdrivefbetween-:the wheelzhub adptedlinconnection.with upvairl:moyein'eri't.of` f Pm'and Saiduplfe" endv3 0f the'spndle? tneshaftto misethewheeitaas'iight.extenewith LECPQLD'H- METZGER? spect to. the spindleVandh effect breaking; ofi the WZSONv B3 MUSE# 'icti'onal drive] ybetween the wheel hub pant udma? REFERENCES CITED said upper. endofithespidle..

. standingshaft. positioned bepeathlanejmpgm @22911529- Japksonetal;;Aug. 4;v 1942 ment with,7 the-spindle:- havlne the lower. eine...2.3543347 Peers l Jiiiyfzfegieii

